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APPENDIX D: The Dual Gas AMP
A. Dual Gas AMP: General
1. The dual Gas construction allows for two gases
(natural gas and propane gas) to be connected to
the appliance at one time which allows for quick
changeovers of fuel type.
B. Connecting Gas Supply Line
1. This Appliance has two supply gas connections.
Ensure the supply gas lines are connected to the
appropriate gas train on the appliance. The propane
connection is closest to the front of the appliance
labeled LP/Propane.
2. Failure to prevent the gas line from turning could
damage gas line components: blower and gas valve.
C. Dual Gas Components
1. Gas Selection Switch (Natural/Propane Switch)
a. Switches operation from one gas valve to the
other. Used to choose between natural or
propane gas as fuel.
2. Natural Gas Valve
a. Regulates the flow of natural gas into the pre-
mix burner by sensing negative pressure from
the blower.
3. Propane Gas Valve
a. Regulates the flow of propane gas into the pre-
mix burner by sensing negative pressure from
the blower.
4. High Gas Pressure Switches
a. The high gas pressure switches monitor the
supply gas pressure and shut off the electrical
control circuit when pressure rises above the
setpoint. Each gas train has one high gas pressure
switch.
5. Low Gas Pressure Switches
a. The low gas pressure switches monitor the supply
gas pressure and shut off the electrical control
circuit if the pressure drops below the setpoint.
Each gas train has one low gas pressure switch.
D. Gas Selection
1. The Dual Gas AMP features a gas selection (Natural/
Propane) switch that electrically separates the two
gas valves.
2. The Natural/Propane switch is a heavy duty
hesitation switch that allows for easy and safe
changeovers of fuel.
E. Electrical Operation
1. The Gas selection switch on NATURAL
a. The boiler control will receive signals from the
natural gas pressure switches only, and send
power to the natural gas valve.
2. The Gas selection switch on PROPANE
a. The boiler control will receive signals from the
propane gas pressure switches only and send
power to the propane gas valve.
F. Changing Gas Type During Operation
1. Turn off power to the burner. (set ON/OFF switch
to OFF)
a. Switching the gas without turning off power will
cause a hard lockout and require a manual reset.
2. Flip the gas selection switch to the desired gas type.
(PROPANE/NATURAL)
3. Turn on power to the burner. (set ON/OFF switch
to ON)
a. If the appliance locks out on gas pressure
switches, the switches and the control will need
to be manually reset.
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